The news wasn't so good for Rio bronze medallist Sam Meech who was 19th in the first race before a mistake cost him in the second.
"It was not such a good day for me," Meech said. "I had a pretty average first race. It got really spread out and it was quite tricky to catch up. Then, unfortunately, in the second race I got a black flag for being over the line too early. It was my own fault. I was pretty far over.
"It's not the best way to start the regatta. From here, I will need to sail pretty consistently and pretty well to catch up. Fingers crossed for some good races tomorrow and a chance to move up the scoreboard a bit."
Meech is 43rd overall and will be able to drop his black flag as a discard for his worst performance but can't afford any more slip-ups with eight races remaining before Sunday's top 10 medal race.
Susannah Pyatt is 17th in the Laser Radial fleet after a 12th and an 18th and Antonio Cozzolino is 27th in the men's RS:X.
More than 370 sailors from 54 nations are competing in Aarhus, which is a good opportunity to acclimatise to the sailing conditions ahead of next year's combined world championships. New Zealand's 49er and 49erFX sailors have opted to train in Porto instead with their class world championships later this month and the 470 crew of Paul Snow-Hansen and Dan Willcox have already had their pinnacle event for 2017 when they finished ninth at the 470 world championships.
Results and standings from the sailing world championships test event in Aarhus overnight (NZ time):
Nacra 17 (13 boats)
1st: Ruggero Tita / Caterina Marianna Banti (ITA) 1 (2) 1 - 2 points
2nd: Gemma Jones / Jason Saunders (NZL) 2 1 (3) - 3 pts
3rd: Jason Waterhouse / Lisa Darmanin (AUS) 3 (10) 2 - 5 pts
Laser (62 boats)
1st: Tom Burton (AUS) 3 2 - 5 pts
2nd: Matthew Wearn (AUS) 2 3 - 5pts
3rd: Tom Saunders (NZL) 6 4 - 10 pts
43rd: Sam Meech (NZL) 19 63 (BFD) - 82 pts
Laser Radial (27 boats)
17th: Susannah Pyatt (NZL) 12 18 - 30 pts
RS:X (46 boards)
27th: Antonio Cozzolino (NZL) 19 (34) 27 - 46 pts